This still happens with a fresh install of Ubuntu 13.04 (final release), using nvidia driver 313. Correcting the refresh rate (uncheck autodetect, set to 60) in CCSM fixes it.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to nvidia-graphics-drivers in Ubuntu. https://bugs.launchpad.net/bugs/92599 Title: Incorrect (low/stuttering) refresh rate with NVIDIA driver Status in Compiz: Fix Released Status in Compiz Core: Fix Released Status in Ubutter: Making Ubuntu buttery smooth: Fix Released Status in “compiz” package in Ubuntu: Fix Released Status in “nvidia-graphics-drivers” package in Ubuntu: Invalid Bug description: The problem here is that incorrect information from the NVIDIA driver is tricking some software like Compiz into using an incorrect refresh rate, which makes the whole desktop look choppy. The cause of this framerate problem is the DynamicTwinView feature of the NVIDIA graphics driver. It appears to be a documented "feature" of the driver, and has been for several years: --- Quote from the NVIDIA documentation --- Option "DynamicTwinView" "boolean" Enable or disable support for dynamically configuring TwinView on this X screen. When DynamicTwinView is enabled (the default), the refresh rate of a mode (reported through XF86VidMode or XRandR) does not correctly report the refresh rate, but instead is a unique number such that each MetaMode has a different value. This is to guarantee that MetaModes can be uniquely identified by XRandR. When DynamicTwinView is disabled, the refresh rate reported through XRandR will be accurate, but NV-CONTROL clients such as nvidia-settings will not be able to dynamically manipulate the X screen's MetaModes. TwinView can still be configured from the X config file when DynamicTwinView is disabled. Default: DynamicTwinView is enabled. --- End quote --- [http://us.download.nvidia.com/XFree86/Linux-x86/280.13/README/xconfigoptions.html] WORKAROUND (1) (in /etc/X11/xorg.conf) Section "Device" Option "DynamicTwinView" "False" EndSection If the workaround doesn't work for you and you still see stuttering/jerkiness then you probably have bug 888039, which is caused by other performance regressions in the Ubuntu 11.10 release. WORKAROUND (2) CCSM > Composite > Detect Refresh Rate = OFF Refresh Rate = 60 (or whatever is correct for you monitor) ORIGINAL DESCRIPTION: Binary package hint: xorg My Samsung SyncMaster 931BF does actually support 75 hz screen refresh rate, but xorg lets me choose only between 50 Hz and 54 Hz. Modification of /etc/X11/xorg.conf does not help. xorg worked ok on edgy. Here's some info: $ uname -a Linux Xel-Naga 2.6.20-10-generic #2 SMP Mon Mar 12 00:02:49 UTC 2007 i686 GNU/Linux $ apt-cache show xorg | grep Version Version: 1:7.2-0ubuntu7 The video card is Nvidia GeForce 7300GS. ProblemType: Bug Architecture: i386 Date: Thu Mar 15 21:08:22 2007 DistroRelease: Ubuntu 7.04 Uname: Linux Xel-Naga 2.6.20-10-generic #2 SMP Mon Mar 12 00:02:49 UTC 2007 i686 GNU/Linux To manage notifications about this bug go to: https://bugs.launchpad.net/compiz/+bug/92599/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
